Strontium
San Francisco City Water System
Strontium is a metal that accumulates in the bones. Radioactive strontium-90 can cause bone cancer and leukemia, and any form of strontium at high doses can harm bone health.
19
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2013 | 0.0743 ppb | 16 | 16 | 0.0150 ppb - 0.170 ppb |
2014 | N/A | 0 | 0 | N/A |
2015 | N/A | 0 | 0 | N/A |
2016 | 19.4 ppb | 1 | 1 | ND |
2017 | 38.7 ppb | 1 | 1 | ND |
2018 | 15.0 ppb | 1 | 1 | ND |
2019 | N/A | 0 | 0 | N/A |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 1,500 ppb
The EWG Health Guideline of 1,500 ppb for strontium was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against harm to bones.
ppb = parts per billion
All test results
Date | Lab ID | Result |
---|---|---|
2013-01-31 | 201302010153AM | 0.1000 ppb |
2013-01-31 | 201302010154AM | 0.1000 ppb |
2013-02-21 | 201302220322AM | 0.170 ppb |
2013-02-21 | 201302220323AM | 0.160 ppb |
2013-04-29 | 201304300195AM | 0.0180 ppb |
2013-04-29 | 201304300206AM | 0.0450 ppb |
2013-06-06 | 201306070190AM | 0.0970 ppb |
2013-06-06 | 201306070202AM | 0.0730 ppb |
2013-07-30 | 201307310290AM | 0.0150 ppb |
2013-07-30 | 201307310249AM | 0.0170 ppb |
2013-08-12 | 201308130152AM | 0.0810 ppb |
2013-08-12 | 201308130156AM | 0.1000 ppb |
2013-10-07 | 201310080353AM | 0.0230 ppb |
2013-10-07 | 201310080350AM | 0.0310 ppb |
2013-10-10 | 201310110456AM | 0.0660 ppb |
2013-10-10 | 201310110406AM | 0.0930 ppb |
2016-06-14 | 19.4 ppb | |
2017-06-19 | 38.7 ppb | |
2018-06-18 | 15.0 ppb |